Allow init of NestedDtype with pd.ArrowDtypes or Mappings

[dougbrn]

When v0.6 is merged, #356 will be resolved

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.77%. Comparing base (dd891ae) to head (1e4b8a3).
⚠️ Report is 2 commits behind head on v0_6.

Additional details and impacted files

@@            Coverage Diff             @@
##             v0_6     #374      +/-   ##
==========================================
- Coverage   97.78%   97.77%   -0.02%     
==========================================
  Files          19       19              
  Lines        2035     2025      -10     
==========================================
- Hits         1990     1980      -10     
  Misses         45       45              

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[github-actions]

Before [1cae194]	After [9327999]	Ratio	Benchmark (Parameter)
42.4±2ms	47.0±0.3ms	~1.11	benchmarks.ReassignHalfOfNestedSeries.time_run
857M	941M	1.10	benchmarks.ReadFewColumnsS3.peakmem_run
11.3±0.2ms	11.8±0.4ms	1.04	benchmarks.NestedFrameAddNested.time_run
245M	250M	1.02	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
32.6±0.8ms	33.3±0.3ms	1.02	benchmarks.AssignSingleDfToNestedSeries.time_run
1.57±0.01s	1.59±0s	1.02	benchmarks.ReadFewColumnsHTTPS.time_run
102M	103M	1.01	benchmarks.NestedFrameAddNested.peakmem_run
177M	178M	1.01	benchmarks.ReadFewColumnsHTTPS.peakmem_run
136M	136M	1.00	benchmarks.CountNestedBy.peakmem_run
64.6±1ms	64.5±0.5ms	1.00	benchmarks.CountNestedBy.time_run

Click here to view all benchmarks.

[hombit]

Thank you!